In November 1967, prior to the publication of the book, Thompson stated that the Dal-Tex Building may have been the location of the second shot. He said that a young man was arrested within minutes after the shooting in that building, taken in for questioning by police, then disappeared in the confusion.
In 1991, Bob Hoover of the Pittsburgh Post-Gazette wrote that Six Seconds in Dallas "remains one of the most plausible explanations for the line of fire in Dealey Plaza."
Thompson and his publisher were sued by Time, Inc. for infringement of copyright because of Zapruder frames sketched in the book. A federal court gave summary judgment to Thompson and his publisher ten months later in a landmark decision stressing First Amendment rights (Time Inc. vs. Bernard Geis, et al., 293 F. Supp. 130, S.D.N.Y. 1968)